Breaking: #69148 - Backend Module Dispatching removed 

See forge#69148

Description 

Dispatching Backend modules through custom dispatchers have been removed. The corresponding Extbase functionality called "ModuleRunner" and its Interface have been removed as well.

Impact 

Any dispatcher registered via $TBE_MODULES['_dispatcher'] is not evaluated anymore.

Affected Installations 

All TYPO3 Instances with an extension that registers a custom backend module dispatcher.

Migration 

Use a custom RequestHandler.